#pragma once

#include "Poller.h"
#include "Timestamp.h"

#include <vector>
#include <sys/epoll.h>

class Channel;

/**
 * @brief epoll类（epoll_create,epoll_ctl,epoll_wait）
 *
 */
class EPollPoller : public Poller
{
public:
    EPollPoller(EventLoop *loop);
    ~EPollPoller() override;

    // 重写基类方法
    Timestamp poll(int timeoutMs, ChannelList *activeChannels) override;
    void updateChannel(Channel *channel) override;
    void removeChannel(Channel *channel) override;

private:
    static const int kInitEventListSize = 16;

    // 填写活跃链接
    void fillActiveChannels(int numEvents, ChannelList *activeChannels);
    // 更新channel通道
    void update(int operation, Channel *channel);

    using EventList = std::vector<epoll_event>;

    int epollfd_;      // epoll句柄
    EventList events_; // 关注的事件
};